Apparatus for treating material



May 6, 1930.

A K. T. POTTHOFF APPARATUS FOR TREATING MATERIAL F iled June a, 1927 14 Sheets-Sheet l Jaw/$7M May 6, 1930. K. f. POTT-HOFF APPARATUS FOR "TREATING MATERIAL Filed June 8, 1927 14 Sheets-Sheet 2 k JNIENTOR /W./ AJ/ZZX 4a 11M.

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May 6, 1930. K. T. 'POTTHOFF APPARATUS FOR TREATING MATERIAL Filed June 8, 1927 May 6, 1930.

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AfeUr Zgy May 6, 1930. K. T. POTTHOFF APPARATUS FOR TREATING MATERIAL Filed June 8, 1927 14 Sheets-Sheet 12.

May 6, 1930. K. T. POTTHOFF APPARATUS FOR.TREATING ATERIAL Filed Jun' s, 1927 14 Sheets-Sheet l3 angg nto'z 0% May 6, 1930. K. T. POTTHOFF 7,

APPARATUS FOR TREATING MATERIAL Filed June 8, 1927 14 Sheets-Sheet 14 Q? m NR E 'o no Patented May 6, 1930 UNITED STATES PATENT OFFICE KURT THEODORE IEOTTHOFF, 0F BROOKLYN, NEW YORK, ASSIGNOR TO U. S. GALVANIZ- ING & PLATING EQUIPMENT CORPORATION, A CORI'ORATION OF NEW YORK APPARATUS FOR TREATING MATERIAL Application filed June a,

This invention relates to machines for treating articles in a liquid such for instance as a cleaning or pickling solution for small articles or any other liquid treatment for coating said articles.

Such small articles as knives, forks, spoons and the like require verycareful and uniform treatment in the liquid and when handled in a mass have a tendency to stick together or to become wedged into parts of the treating or conveying mechanism so that the articles are liable to become spotted or bent. In the prior treatment of such articles much hand labor .has been involved and the ma-- chines used have been objectionable in their failure to properly stir and tumble and mix the articles to give the desired uniform treatment over all of the surfaces. It has also been difiicult with prior mechanisms to have free and open access to the articles at all times so that in case of jamming of any of the articles in any part of the apparatus, it has been necessary to detach portions of the I mechanism to reach the inside.

To overcome these objections the apparatus of this invention provides a series of open topbasket like containers whichare moved or rocked to agitate and stir the material in the liquid and at predetermined intervals these containers are shifted so as to transmit the load ofmaterial from one to the other and thus further stir and mix thematerial and break up any adhesion between the individual articles. Specifically. certain of the basketsare first rocked from receiving position to an upright or intermediate positionand then back to the receiving position. This series of operations continues over a certain predetermined period until finally the basket is brought to its intermediate position and from there bodily raised to discharge its contents into a second basket'which-is in a receiving position. Thefirst basket is then lowered to its intermediate:\ position after which its cycle of operation will be repeated while the second basket is rocked from and to its receiving position in the same manner as previously described in connectionwith the other basket. Finally the second basket 1927. serial No. 197,414.

parallelto each other,'it will, of course, be

understood that one or any number might be used.

. It is a further object of my invention to utilize the baskets in a plurality of sections whereby the baskets in the first section, which baskets are disposed in a suitable solution, 1

can effect a cleaning action of the articles disposed therein. The second section might contain suitable solutions, such as acids or the like. More specifically the first section is made up of a loading basket, a series of 73 ,cleaning baskets, and finally, what might be termed, transferring baskets. With the exception of the transferring baskets each basket consists of a single basket-shaped member having a partition intermediate its ends to form two article receiving compartments. As will be clear from thedisclosure the baskets may comprise a single compart- I ment or a multiplicitythereof and the operation of the various baskets controlled ac cordingly.- The loading basket compart- 'ments receive the articles alternately and alternately discharge the same into the first cleaning or receiving basket. This latter basket is .then actuated or rocked a certain number of times after which it is bodily raised to discharge simultaneously its contents from both compartments into the second cleaning basket. The above cycle is then repeated for each cleaning basket until the i transferring baskets are reached. The transferring baskets are mounted on separate aligned shaftsand each is adapted to receive the articles from one compartment of the cleaning baskets. Certain of the articles will have then been subjected to the cleaning solution longer than other of the articles and to compensate for this difference, suitable mechanism is 'provided for rocking one of the'transferring baskets in its solution a longer time than the other basket. The second section of baskets comprises a series of single baskets each having only a single compartment and similarly arranged to those in the first section. This single basket arrangement is permitted for the reason that the articles are passed through the solutions into which the second section baskets are disposed, twice as fast'as through the solution of the first section. The transferring baskets are so timedthat they will discharge their contents alternately into the second section baskets. It will thus be seen that the transferring baskets perform-in addition to the compensating. function, the function of feeding the articles a single line.

It is an object of my invention to accomplish'the above results in a very simple and efiicient manner considering the several functions to be performed.

It is desirable to be able to change the length of time for subjecting the articles to certain solutions and'it is an object of my in-- vention to provide improved means. for accomplishing this result. It is a further ob-- ject to provide means whereby this time interval may not be changed without first stopping the machine. Another object is to provide in combination with the first and second sections, a dryingmechanism which has has kets or suitable receptacles operated in timed relation tot he other baskets, thereby receiving the articles from each basket and keeping the same separated.

With the foregoing and other objects in view my invention consists of certain other novel features of construction and arrangement of parts which-will be apparent from the disclosure hereinafter more fully described and shown by the accompanying drawings wherein Fig. 1 is a perspective of the first and second sections.

Fig. 2 is a sideelevation of the first ction Fig. 3 is a side elevation of the second section and a part of the first section;

Fig. 4 is a plan view of .thefirst. section and a fragment of the second section.

Fig. 5 is a plan view of thesecond'section with parts of the drying mechanism and the second section attached.

Fig. 6 is a plan view of the drying mechamsm.

Fig. 7 is a side elevation of the drying mechanism.

Fig. 8 is a side elevation of a air of the baskets in-the first section an shown in their intermediate position.

from a parallel line into of one Fig. 9 is a view similar to Fig. 8 showing the baskets in a receiving position.

Fig. 10 is a view of the baskets shown in Fig. 8 in their cooperating, discharging and. receiving positions.

'Fig.,11 is a vertical transverse section taken substantially on the 'line 11-11 of Fig. 8, and showing the clutch mechanism and cam control therefor which is adapted to control the discharging position of the baskets.

Fi 12 is a view similar to Fig. 11 showing t e clutch engaged.

Fig. 13 is afragmentary side elevation of {{he machine adjacent the transferring basets.

Fig. 14 is a vertical transverse section taken substantially on line- 16-16 of Figs.

5 and Fig 17 is a continuation of the right hand end of Fig. 16."

Fig. 18 is. a vertical transverse section taken substantially on the line 18-18 of Figs. 13 and 16.

Fig. 19 is a plan view of the mechanism for var 'n the time interval 'of submersion as et in its solution. I

Fig. 20 is a side elevation thereof.

Fig. -21 is 'a/ transverse section on line 21-21 of Figs. 19 and 20.

Fig. 22 is a developed view of the'shifting cam for the controlling mechanism shown in Figs. 19 and '21. I

, Fig. 23 is a diagram showing the relative posit ons between the cam for bringing the baskets to their discharging position and-the I-beam side members 2 mounted upon a series of standards 3. Disposed below the frame and intermediate the sides is a tank 4 which has an opentop and may be made of any -material suitable'for the li uid to be contained therein. As shown in terminates at 5 and 6 while the side walls 7 thereof are spaced inwardly fromthe side members 2. The top 8 is disposed below the sides 2 to permit aseries of baskets to, be suitably carried by the side members 2. A loading basket 9 has an arcuate bottom and end members 10 and 11 intermediate of which is a partition 12. A suitable deflectin means mounted on the front end 13 may e used and which will be described later in connection with. other of the baskets. The loading basket is immovably secured to a transverse shaft 14 which in turn is immovably secured to a pair of lifting arms 15' disposed at each ig. 4 this tank end of the basket 9. The arms 15' are secured to a transverse shaft 16 which in turn is carried by the sides '2 in journals 17. The means for actuatingthe loading basket will be described later in connection with the remaining baskets of the first section which comprise a series of identical baskets 20,21, 22 and 23 and a pair of transferring baskets 24L and 24B. While four baskets have been shown intermediate the loading basket and transferring baskets, it will be understood that any desired number may be used or that the same may be of any width suitable. Each I terial to allow the solution to drain from the of the baskets 20 to 23 has, .as shown in Fig. 8, a substantially flat bottomportion 25 terminating in a'rearward portion 26 and an.up-

wardly extending portion 27. The bottom 25 maybe made of any suitable perforated ma-- basket when it is raised to discharging position. The portion 27 carries, if desired, a removable discharge chute 28 whichtapers toward its outer end. All of the baskets includin the loading basket may be provided with a discharge chute 28 although under certain circumstances such may not be necessary. Each of the baskets 21) to 23 is secured to a shaft 29 extending across the top thereof. The outer ends of the shafts' are journalled in lifting arms 15. The other ends of the lifting arms are journalled upon transverse shafts .30 disposed normally. in front of each basket. 1

It will be noted that each of the baskets 20 to 23 is providedwith a'fpartition 31 in alignment with the partition 12. The rocking mechanism for the baskets 20 to 23 is identical for each basket and the description of one will suffice for all. This mechanism com-' prises a reciprocable rod 34 disposed along one of the side members 2. This rod is reciprocated by suitable mechanism to be later described. Journalled upon the shaft is an arm 35 the outer end of which is pivotally secured as at 36 to the rod 34. Projecting rearwardly from the arms 35 is a bearing lug 37 to which is pivotally secured at 38 a connecting link 39, the outer end of which is pivotally connected as at 40 to a crank arm 41. The crank arm 41 is secured to an outer end of the shaft 29. It will thus be seen that upon reciprocation of the rod 34, the basket will be oscillated or rocked from its intermediate position as shown in Fi 8 to its receiving position as shown in ig. 9 and vice versa. During this movement the arms 15 are stationary and the shafts 29 rest in suitable supports 42, which as shown in Fig. 10 are mounted on the'top of each of the sides of the tank 4. It will be understood that material of one particular kind, sayz spoons, will be transferred from compartment 9L of the loading basket 9-to the compartment 20L of the basket 20 when the latter is in its receiving position as is shown in Fig. 9. The loading basket 9 will thereafter be returned to receive another load of ma- .basket 21 as shown in Fig. 10. Due to the alternate feeding of the material, first to the compartment 20L and then to the compartment 20R, and the simultaneous discharge from both compartments, the contents in the compartment 20L will be subjected to the solution within the tank '4 a greater length of time than the contents of the compartment 20R. This inequality, however, is compen- .sated for by the transferring baskets to be described later. In the machine herein disclosed thetiming of the loading basket 9 and the basket 20 is such that the contents of the compartments 2.6L and 20R are subjected to the cleaning liquid one minute and two 1 -minutes respectively. The contents in the compartments of the basket 21 will, of course, be subjected to the 'cleaningliquid the same length 'of time,'namely two minutes, after which the basket 20 will be bodily raised to discharge its contents into the basket 22 and so on to the basket 23'. Each basket is, how- 'ever, rocked in the cleaning solution the same length of. time. p

The mechanism for bodily raising the baskets at predetermined intervals includes clutch mechanism for securing each of the lifting arms to the arms 35 of the rocking mechanism. The loading. basket is not oscil lated and for that reason no linkages similar to the links 39 and 41 are used.. The loading basket 9 is merely bodily raised toits discharging position by mechanism which is identical to the mechanism for connecting the arms 15 of 'the otherbaskets to the arms 35. The description of the mechanism for the basket 20 will 'suflice for all. of the arm 35 carries parellel clutch pins 43 receivable ina groove 44-. formed in the side of a slidable collar 45 which is splined tothe shaft 30. To actuate the. collar 45 a cam shaft 50, as shown in Fig. 2, is disposed along one side of the machine and journalled in .the

standards 3-- A cam 51 is secured to the shaft and has a cam groove 52 in one side is adapted to engage a roller 54 which is carried upona collar actuating'arm 55. This arm is journalled in a suitable bracket as at 56 while its upperend is forked and. pivotally' secured to a ring 57 receivable in a suita-.. ble groove in the collar 45. Rotation of the 'cam 51,, causes engagement of the portion 53- The hub thereof. A raised portion 53 of the groove,

with roller 54 and the collar 45. isbrought into operative engagement with the pins 43. The cams for the respective baskets are given a prime number which is the same as the basket associated therewith. The cams are so timedthat clutch engagement is brought about when the rod 34.is in the osition shown in Fig. 9. To bring one bas et to its dis- .charging position while the others are in their receiving position, it is necessary that the cams be'so timed or angularly disposed about the shaft 50 that the clutch mechanism, sayfor the basket 20, will be in engagement while the clutch mechanisms for the remain- I be positively connected to the shaft 30-asing baskets will be out of enga ement. When the clutch mechanism for ba operative so as to raise the arms 15 disposed on each side of the basket 20, the arm will through the pins 43 and collar which is splined to the shaft 30. The-cam is also timed so that clutch engagement is effected when the rod 34 is in the position shown in Fig. 9. During this position the basket 20 will be in its intermediate position, due to the linkages 39 and 41, but upon movement of the rod 34 in a right hand direction the basket will be bodily raised to a position shown in Fig. 10. Rememberingthat the clutch mechanisms for the remaining baskets are not in engagement upon movement of the rod 34,in the right hand direction, the linkages 39 and 41 for the remaining baskets, such as 21, will cause the same to be swung to their receiving position as shownin Fig. 10. The chute 28 of the basket 20 will then properly discharge the contents from the compartments 20L and 20R to the compartments 21L and 21B.. The contentsof the basket 20 will have been discharged by the time rod 34 moves again in the left hand direction. By the time the shaft 29 is again supported by the supports-42 the cam 51 will have caused disengagement of the clutch mechanism and accordingly thereafter permit the arm 35 to merely have rotatable connection with the shaft 30 therecounterclockwise direction, to its receiving position as shownin Fig. 9, whereupon the compartments 20L and 20R may again be filled as before described. After the basket 21 has been filled, it will be rocked a prede tcrmined number of times before the clutch mechanism does occur the basket 22 will be in a receiving position so that with the relation between the baskets 21 and 22 willbe similar.

to the-relation between the baskets 20 and 21 shown in Fig. 10. This .series of operations of each basket first receiving its material,-

et 20- is made.

same degree of motion will be im then rocking the same a predetermined number of times and then beingraised to discharge its contents into the succeeding basket willbe continued until the transferring baskets 24L and 24B are reached.

.The mechanism for rocking and raising the transferring baskets is broadly identical to the mechanisms for the other baskets with a few minor changes which will be noted. A shaft 60 is supported by suitable journals carried by the frames 2 and by an intermediate bracket 61'supported on a cross'inember 62 which joins the side frames 2. Sleeves 63 and 64 are juornalled upon the shaft 60 at eachside of the support 61. Collars 60 are secured to the shaft-60 to hold the sleeves 63 and 64 in position. Inner lifting arms 65 are secured to the inner ends of the sleeves 63 and 64 while lifting arms 66 are secured to the outer ends of the sleeves 63 and 64. The free ends of the arms 65 and 66 rotatably carry shafts 67 and 68. Secured to the shafts 67 and 68 respectively are the baskets 24R and 24L, it being noted that the latter areapproximately the width of the compartments of the basket 23. The baskets are shaped generally the same as the baskets 2023, and'may be provided with a chute 28 approximately one-half the Width of the chute 28. The chutes 28 will have their outer sides tapered inwardly to a extent possibly than the chutes 28 or the purpose of deflecting the material to a more central position where it will be discharged into the second section of baskets. In this latter sectionthe baskets are disposed in a central position and are not provided with two compartments. The outer end of the shafts 67 and 68 are also sup orted by the supports 42, the inner ends be g supported only by the arms 66. Secured to the shaft 60 adjacent one ofthe side frames 2 is an actuating arm 67 whichas shown in Fig. 14,

reater thereof while the outer end of the arm is pivotally connected to the end of the rod 34. Links 39 and 41, identical to the links connected to the arms 35 for rocking the baskets.

21 and 22 operatively connect the lug'69 and basket shaft 67. Mechanism for reciprocating the rod 34 is connected to the arm 67 as by a link 70 which in turn is t'zonnected to a suitable crank to be described later. To rock the basket 24L independently of the basket 24R, there is secured to the other end of the.

shaft 60 a short arm 71 which is connected to a link 72 in turn pivotally secured to a crank arm mounted upon the, outer end of the shaft 68, said'arm being identical to the arms 41. The point of pivotal connection between the link 72 and arm 71 is'in alignment with the axis of the bearing lug 69 so that the rted to both baskets 24L and 24B. It wi], othus be seen that during continued reciprocation of the rod 34 as by the link 7 0' the shaft will have been subjected to the solution in tank 4,

the basket 24L'is made to'rock two minutes whereas the basket 24R rocks only one minute before said baskets are raised to their discharging position. This will thereby cause the articles being cleaned to have been subjected an equal length of time to the solution within the tank 4.- Due to the fact that the baskets 24L and 24R are filled simultaneous-' ly from the basket 23, it will be seen that the basket 24R will discharge its contents one minute before the basket 24L discharges its contents. To accomplish this a clutch collar 75 is splined to the shaft 60 and adapted to engage clutch pins 76 which are carried by thehub of the arm 66. This clutch mechanism is disposed between the end of the s eeve 63 and the frame 2 and is actuated by a 77 pivotally supported at onefend by a bait 56 while its other end is pivotally co ected to a link 79 which in turn is connected to a clutch shipper mechanism 80. As shown in Fig. 14 the arm 77 carries a roller 81 receivable in a cam groove 82 formed in the face of a cam late 83 which is secured to the shaft Tllis cam plate .is identical in construction to the cam 51 but is angularly disposed relative to the other cams to obtain proper timed operation of the clutch 75. In order to actuate the basket 24L a clutch mechanism 85 is disposed between the right hand end of the sleeve 64 and the adjacent side frame 2. This clutch mechanism also includes pins 76 and a shi per mechanism 86. The latter is operated by a lever 87 pivoted upon the cross frame 62. A depending arm 88 is connected to-an arm,8'9 carried upon a hub 90, as bya connecting rod 91. The hub 90, hke

thear m 77, "is journalled" upon the shaft 56 which is supported by the standards 3 as shown in Fig. 9. Secured to the otherend vof the hub 90 is a short arm 93 whichcarries -relatively angularly disposed so' that the clutch 75 will be thrown into engagement prior to engagement of the clutch 85, thereby lifting the basket 24R approximately one minuteprior to the lifting of the basket 24L. It will thus be seen that the baskets 24L and 24B discharge alternately into a basket of the second section.

The second section comprlses a frame having sides 100 which, as shown 1n Flg. 5, are

= disposed inwardly from the sides 2 of the first section frame. This is for the reason that the baskets in the second section are approximately one-half as wide as the baskets in the first section. The sides 100 are supported by standards 101. A series of separate tanks 101', 102, 103 and 104 are disposed between the sides 100, while a. series of baskets 105, 106, 107 and 108 are adapted to submergetheir contents within any;suitable solutions contained within the res ective tanks. It is desired to pass the artlcles through the second section at a greater rate than through the first section, and to accomplish this the second section baskets are operated at a greater rate than the baskets of the first sectlon. Also certain of the baskets of the second section are operated at a different rate.- Due to this latter condition, the

second section baskets are operated by a different combination of linkages than are the baskets of the first section. The baskets of the second section and their operating mechanism are best shown in Figs. 16 and 17, the latter being a continuation of the right hand .end of Fig. 16. As shown in Fig. 5, the basket 105 is secured to a transverse shaft 111 which is rotatably supported by journals 112 'carried on the side frames 100. The shaft 109. is also adapted to rest in supports 42 which are carried on the top of the sides of the tank-101. An arm 113 is secured to one endof the shaft 109 and a link 114 is pivotally connected to the arm 113 as at 115. The inner end of the link 114 is-pivotally connected as at 116 to an arm 117 which projects outwardly from the hub 118. This hub the clutch hub 118 is a shiftable clutch collar -124. This collar is actuated by a forked end 125 of a lever 126 which is pivotally supportis journalled upon the shaft 111 and carries ed upon a shaft 127. The shaft 127 serves the same purpose as the shaft 56 and is sup-- portedby bracket a'rms 128 depending from the standards 101. The arm 126 carries a cam roller 129 which is receivable in a cam groove in the face of the cam plate 130. The cam plate 130' is secured to a shaft 131 which is rotatably supported by brackets 128.

These brackets are-secured to the standard 101 similar .to the manner of supporting the shaft: 50by the'standards 3. The rod 121, as seenfrom combined Figs. 16 and 17 extends past the baskets 106 and 107 without connection thereto in any 'way,'and is finally pivotally connected as at 135 to a rocking arm 136. This arm has a hub journalled upon a shaft 137 and with which is associated clutch mechanism identical 'to the clutch mechanism ,associatedfwith the arm- 119. lVith the exception of the pivot lug 123, the arm 136 is identical in all respects to the ,5 arm 119. The arm 136 has an arm 138 to which is operatively connected rocking links 113 and 114. The basket'108 is secured to a shaft 139 which, is pivotally supported at its outer ends by lifting arms 140. The shaft 139, like the other basket shafts, is removably supported by supports 42. The clutch mechanism for the arm 136 is actuated by a forked arm 141 which is pivotally mounted upon the shaft 127 and carries a cam roller 142. A cam plate 143 secured to the cam shaft 131 has a cam groove to receive the roller 142. This cam plate is identical to the other cam plates. It will thus be seen that the baskets 105 and 108. can be given a rocking motion in addition to being lifted to their discharging position.

The intermediate baskets 106 and 107 (Figs. 16 and 17) are actuated by common linkages although the basket 106 does not as have any rocking motion. Instead, as soon as articles are discharged into basket 106 the same is lifted substantially immediately to its dischar ing positon although the basket 107 has roc ing motion in addition to its discharging moti'on. To accomplish these results, the basket 106 is secured to a transverse shaft 150 which is journalled in the free ends of lifting arms 151. The inner ends of the lifting arms are secured to a transverse shaft 152 which is supported by the side frames 100 as in journals 153. The

shaft 150 is also removably supported in supports 42. A member having a hub .154 rotatably mounted on the shaft 152 has arms 155 and 156 extending the opposite directions. The arm 155 is pivotally connected to a link 157 which is actuated by suitable mechanism to be described later; The arm 156 is pivotally connected to a reciprocating rod 158. The hub 154 has a clutch mechanism associated therewith identical to the clutch mechanisms associated with the shafts of the other baskets. This clutch mechanism is controlled by a cam plate 159 cooperating with a roller 160 which is carried upon a clutch-shipping arm 161, the arm 161 being pivotally mounted upon the shaft 127.. Certain other details of construction are embodied in the cam mechanism 159 for the purpose of' varying the length of time of submersion in the liquid of the articles carried by the basket 106. This mechanism will be described later.

which is secured to the shaft 150. During In order ,to turn positivelythe basket 106 completely over as shown in the frame 100 and has associated therewith clutch mechanism similar to the clutch mechanisms for the other baskets. A cam plate 169 secured upon the shaft 131 cooperates with a cam roller 170' which is carried on a clutch-actuating arm 171. The arm 171 is also journalledon the shaft 127. The arm 166 carries a bearing lug 172 to which is pivotally connected a rocking link 173. 1 An arm 174 pivotally connected to one end of the link 173 is secured to a shaft 175 which carries the basket107. This shaft is journalled in the free outer end of lifting arms 176. The shaft 175 is' also removably supported by supports 42.

The actuating mechanism for the cam shafts 50 and l3l and the links 70, 114 and 157 is disposed at one side of the adjacent ends of the two sections. This mechanism is generally indicated by 190 and comprises, ;as best shown in Figs. 13, 16 and 18, a casing 191 having laterally extending supporting portions 192 and 193 disposed on the top of the frame members 2 and 100. This casing, in addition to formin a housing for the several gears to be descri ed, also rovides suitable journals for the gear sha ts. A longitudinal shaft 194, extending beyond the side of. the casing, has secured thereto a driving pulley 195, while an idler pulley 196 is freely rotatable thereon. A worm 197 secured to the shaft 194 meshes with a worm gear 198 which is secured to a transverse shaft 199. The shaft 199 is suitably .journalled in the casing 191 and carries a worm 200 and a pin.- ion 201. A longitudinal shaft 202 carries a worm gear 203 meshingwith the worm 200 and a sprocket 204. To drive the cam shaft 50 a chain 205 runs on the sprocket 204 and on a sprocket 206 which is secured to the shaft 50. The sprockets 206 and 204-are of the same diameter. To drive the cam shaft 131 at twice the speed of the cam shaft 50, a sprocket 207 is secured to the shaft 50, while a sprocket 208 is secured to the shaft 131, the sprocket 208 being'one-half the diameter of the sprocket 207. A chain 209 connects the I sprockets, and as shown in Fig. 5 the chain 209 extends laterally of the frames2 and 100. The mechanism for actuating'the link 157 comprises a shaft 210 carrying a gear 211 which is driven by the pinion 201 as through an intermediate or idler gear 212, all of which are suitably supported by the casing 191. A crank arm 213 secured to the shaft 210 is pivotally connected as at 214 to the link 157. To actuate the link and accordingly recipro- 

